//The MIT License

//Copyright (c) 2009 Lluis Sanchez, Nick Darnell

//Permission is hereby granted, free of charge, to any person obtaining a copy
//of this software and associated documentation files (the "Software"), to deal
//in the Software without restriction, including without limitation the rights
//to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
//copies of the Software, and to permit persons to whom the Software is
//furnished to do so, subject to the following conditions:

//The above copyright notice and this permission notice shall be included in
//all copies or substantial portions of the Software.

//THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
//IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
//FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
//AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
//LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
//OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
//THE SOFTWARE.

using System;
using System.Collections;
using System.Reflection;
using System.Reflection.Emit;
using System.Collections.Generic;

namespace Polymorph
{
    public class CodeSwitch : CodeStatement
    {
        List<CodeExpression> m_conditions = new List<CodeExpression>();
        List<CodeBlock> m_blocks = new List<CodeBlock>();

        public CodeSwitch()
        {
        }

        public void AddCase(CodeExpression condition, CodeBlock block)
        {
            m_conditions.Add(condition);
            m_blocks.Add(block);
        }

        public override void Generate(ILGenerator gen)
        {
            if (m_blocks.Count == 0) return;

            CodeIf initialIf = new CodeIf(m_conditions[0]);
            initialIf.TrueBlock = m_blocks[0];
            CodeIf prevCif = initialIf;

            for (int n = 1; n < m_blocks.Count; n++)
            {
                CodeIf cif = new CodeIf(m_conditions[n]);
                cif.TrueBlock = m_blocks[n];
                CodeBlock cb = new CodeBlock();
                cb.Add(cif);
                prevCif.FalseBlock = cb;
                prevCif = cif;
            }

            initialIf.Generate(gen);
        }

        public override void PrintCode(CodeWriter cp)
        {
            for (int n = 0; n < m_blocks.Count; n++)
            {
                if (n == 0)
                    cp.Write("if (");
                else
                    cp.Write("else if (");

                m_conditions[n].PrintCode(cp);
                cp.Write(") {");
                cp.EndLine();
                cp.Indent();
                m_blocks[n].PrintCode(cp);
                cp.Unindent();
                cp.BeginLine().Write("}");
                if (n < m_blocks.Count - 1)
                {
                    cp.EndLine();
                    cp.BeginLine();
                }
            }
        }
    }
}